I'm in the market for a MacBook or MacBook Pro. I've been weighing the options and there is one unanswered question that I have. What about the GPU? I know that the past couple of years has started to open up the GPU as a general-purpose device as part of the computer. Other than audio/video encoding/decoding, are there any really good applications for GPUs that are out or 'just around the corner' that would warrant getting a Pro over a regular MacBook?